Boiler



(No Mode ll) L. SAUNDERS.

BOILER Patented June 16, 1896.

AN DREW BYGRAHAM, PHDTG-UTMQWASNINGTOND C UNITED STATES PATENT OFFICE.

LEWIS SAUNDERS, OE LAWVRENOE, MASSACHUSETTS.

BOILER.

SPECIFICATION forming part of Letters Patent No. 562,199, dated June 16,1896.

Application filed January 11, 1894. Serial No 496,467. (No model.)

To in whom it may concern:

Be it known that I, LEWIs SAUNDERS, 0 Lawrence, in the county of Essex,State of Massachusetts,have invented certain new and useful Improvementsin Boilers, of which the following is a description sufficiently full,clear, and exact to enable any person skilled in the art or science towhich said invention appertains to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure 1 is a side elevation of my improvedboiler, the casing being removed; Fig. 2, a front elevation of the same,and Fig. 3 a sectional view of one of the circulation-tubes.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings.

My invention relates especially to a square, vertical boilerparticularly adapted for heating purposes, the object being to obtainextended water-space with rapid heating capacity.

In the drawings, A represents the fire-box centrally in which there is arectangular tank B, disposed over the grate. On the front and back ofsaid box a series of circulation-tubesb are arranged vertically. Thesetubes are shown in detail in Fig. 3, and are closed byinwardly-depressed heads f, connected centrally by flues g.

The tank 13 istapped by horizontal ducts d, which pass through the sidesof the circulation-tubes b, flush with their heads f. As many of thesecirculation-tubes may be employed as desired and they may be of anysuitable length, or their lengths may vary. Above the upper ducts d thespace within the tank B forms the steam-dome. A nipple j taps the top ofthe tank, to which a steampipe may be attached.

NVater is conveyed to the boiler by a pipe 70, passing centrally overthe fire-box and into the bottom of the tank.

culation-tubes to the longest sides, but they may be also applied to theends. By this construction square boilers of any length may be formedwith a very large water-space, dry steam being generated in the top ofthe central box or tank, which acts as the steamdome, and a constantcirculation maintained through the tubes d. This construction isparticularly adapted for hot-water heating and is exceedingly cheap andsimple.

The tank B may be extended downward into the fire-box for gas-heating,if desired.

Having thus explained myinvention, what I claim is In a boiler of theclass described the firebox in combination with the rectangular tankhaving the water-inlet, is, through the firebox into its bottom and thesteam-outlet in its top, two rows of vertical circulation-tubes, b,arranged in parallelism and having their ends closed by heads, f,connected by flues,

the inner row of tubes being the shorter and said tubes being eachindependently connected with the tank by ducts, d, entering the sidewalls of said tank and the tubes adjacent their heads, said tankprojecting above the upper ends of the tubes to form a steamspacesubstantially as shown and specified.

LEWIS SAUNDERS.

Witnesses:

GEOBGE J. JOHNSON, ALVA COAKLEY.

